Milton Friedman and data adjustment
Neil Ericsson, David Hendry, Stedman Hood 04 May 2017
When empirically modelling the US demand for money, Milton Friedman more than doubled the observed initial stock of money to account for a “changing degree of financial sophistication” in the US relative to the UK. This column discusses effects of this adjustment on Friedman’s empirical models. His data adjustment dramatically reduced apparent movements in the velocity of circulation of money, and it adversely affected the constancy and fit of his estimated money demand models.
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